Locking-bolt structure.



W. A. LUMB. LOOKING BOLT STRUCTURE.

APPLIOLATION FILED 00T.24, 1913.

Patented July 7, 19M

y ment between the bolt and jamb; to provide "enteran erstens ritrarre-ernten.

'WILLIAM LURIE, OF CHICACTMO, ILLINOIS.

Locmnaeoizn STRUCTURE.

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Specification of Letters Patent.

.ment in Locking-Bolt Structures, ofwhich the following is a specitication;

My invention relates vto locks and involves .an improved locking bolt structure which cannot be opened except in the regular manner either bythe door knob or by a key.

Among the important objectsof the invention are to provide a locking bolt which cannot be sprung or forced open as by the therethrough in which and adjacent the ends.

insertion of a knife blade or similar implea locking bolt pf Ithe above character which will not prevent closing or opening ot' ai vdoor in the usual manner; to provide a locking bolt which, when thegdoor is closed or slammed, will expand' to thus prevent its forcing, and in general to provide an -improved locking bolt of the character re erred to which is simple to manufacture and which can be readily 4substituted for the ori dinary bolt in a lock without materially' lchanging the general iock structure.

l ln the accompanyingdrawings which clearly illustrate the various features of the invention, Figure 1 is a side elevational view oi: a. lock with the coverplate removed, Fig. 2 is a similar view but showing the bolt drawn, and Fig. 3 is an enlarged sectional view on plane 3--3 Fig. 1.

. The lock frame shown comprises the rectangular body 5, the escutcheon plate-6, and a cover plate 7 associated in the usual manner. The escutcheon. plate-has the opening 8 for the locking bolt 9 whose headl a isreciprocal in pockets b and c provided in. the body 5 andcoverplate7 respectively. The shank eZ of the bolt has the front and rear studs e and f extending therefrom, the rear .stud e .pivotally receiving the upper end of! bell crank lever 10 Jfulcrumed at its elbow on the stud 11 extending from the lock bodyy 5, the lower end 10 of the lever being en` gaged bythe inner end of spring 12 anchored at its outer end at 13 to the body 5, the spring tending to swing the lever 10 to hold the bolt 9 in its outer positionand to resist inward movement thereof.

The bolt head a lhas'the vertical slot 14e thereof are pivoted at g and g the upper and lowerplates 15 and-15l at their outer.

ends, these plates being yalways within the slot Extending fromthe upper and lower edges respectively of thescplates are dctent itongues 16 and 16"respectively whose inner edges are preferably in arcs centered at the pivot pins g and g respectively. Recipi,rocal on the front face of the bolt 9 is a klwedge'btu: 17 having the guide extension'l! lon its rear side eingaging in the guide groove 19 in the bolt head a. The outer end of the ,bar 17 is pointed to providethe upper and lower wedge surfaces l1.` and It for coperat- :ing with the lower and upper edges z' and i 'respectively of the plates 15 and 15'-, outward movement of the bar causing spreading ot' these plates to carry their detent tongueslG and 16 outside of the slot 14C and in front of the upper and lower yedges of the opening 8 to thus prevent inward movement lof the bolt. Suitable springs 2O and 20 anchored to the bolt shank bear at their outer ends against the inner projections and j respectively on the plates 15 and 15 and tend to bring these plates together to draw in the tongues 16 and 16.

At its inner end the bar 17 forks to receive the stud f on the bolt shank, the rear end or' the bar being thus guided. Extending rearwardly from the bar .is a pin 7c which passes through the longitudinal slot Z in the of the lower end ofthe arm 21 extending structure (not shown). A bell crank lever 22 has in its upper end the slot 23 receiving `elbow on the stud 11 which also pivots the lever 10 already described, The lower end 22 of ,lever 22 is engaged by spring 24 anchored at its outer end to the lockbody as shown at 13, the 'spring tending to resist inward movement of the wedge'bar 17.

.The operation of the mechanism thus far described is apparent. Figs. 1 and 3 show the normal disposition of the parts, the lock-A ing bolt being held out by force of'spring 12 of spring 24, the-detent tongues 16 and 16 being out and infront ofV the escutcheon plate to prevent inward forcing of the lock bolt'. To open the lock the door knob is turned to swing varm 21 against pin 7c, this causing the Wedge bar to be drawninwardly relative to the locking bar until the pin reaches the inner endlof the s ot Z whereshank Z of the locking bolt and into the pathv from the hub 21 for suitable door knobY the pin 7c, this lever being pivoted at its and the wedge bar being held out by force' Patented July 7, 12141. v

.A'ppiieation med oct-oberen i913.- seriai un. 796,981.

upon the locking l`beit is; also drawny u wardly, Fig. 2. When the bar 17 moves along its wedge surfacesl are Withdrawn from the plates 15 and 15, which are then swung together by spring 20 and 20 to draw in the detent tongues to thus allow the inward movement of the bolt when the pin ,7c reaches the end of slot Z. is released the springs 12 and 24 act on levers 10 and 22 to shift the locking bolt and bar 17 together outwardly until the bolt reaches its normal position, spring 24 then continuing to swing lever 22 until bar 17 has been forced outwardly to spread the plates 15 and 15', the detent tongues 16 and 16 being then again eftective'to lock the bolt. A suitable stop lug 25 is provided to limit the outward movement of the bolt 9.

Provision must be made to allow inward movement of the locking bolt when the door is swung to closed position without turning the door knob, as when the door is slammed or blown shut. Accordingly a trip plate 26 is provided, this plate being of segment shape and pivoted at its angle on pin 27 extending through the upper end of the horizontal'slot28 in the bolt head a. A spring 29 secured to the rear side of the locking bar engages at its outer end with the trip plate and tends to swin'g it outwardly to hold its outer edge 26 out of the slot 28. The inner edge 26 is adapted to engage with the-outer end of the guide extension 18 on the wedge bar 17 so lthat when a door is moved toV closed position without turning of the door knob the trip plate will strike the jamb plate in advance of the inclined outer face 9 of the bolt, the result being that the wedge bar 17 is shifted inwardly by the trip plate and the plates 15, 15 are swung by their springs to draw in the dtcnt tongues 16, 16 to allow inward movement of the bolt and closing of the door. As soon as the door is entirely closed the bolt will move out and the wedge bar will shift out to effect spreading of plates 15, 15 and locking of the bolt by the projected'detent tongues.

The lock shown is also provided with a lock operating push button 30 slidable in opening 31 below the lower ends of the levers 10 and 22. In the normal position of the lock parts the end 10 of lever 10 is a distance above the end 22 of lever 22 in order that, upon depression of the but-ton 30, its end 30 willengage first with lever 22 to effect, withdrawal 'of the wedge bar before lever 10 is engaged to effect drawing in of the locking bar, the operation being the same as when the'door knob is turned to swing arm 21.

I thus provide an improved locking bolt which will not interfere with the closing or opening of a door in the usual manner, and

which, when sprung, cannot b e forced orA opened except in the regular manner by knob or key.V The entire structure is very 'lVhen the knobv simple and can readily be installedin ordnary locks.

I do not desire'jto be limited to the exact construction,A arrangement and operation described, as changes and modications are no doubt possible which would come within the ,scope of the invention. I claim as follows: f

1. In alock the combination of a locking bolt having a slot in its head, a plate pivot .ed in said slot and having a detent tongue ertending'therefrom, means tending'to hold the plate to keep its tongue within the slot, a bar on said bolt normally engaging with said plate to cause the tongue to-project loeyond the bolt head side to block inward movement of the bolt, and bolt actuating Vmechanism having'connection with said bar to shift said bar to release said plate before effecting inward movement of the bolt.

2. In a lock, a lock bolt, a detent pivoted to the head of said bolt, means tending to hold said detent entirely within the bolt head sides, mechanismen said bolt coperat- .ing with said detent to effect projection thereof beyond the bolt head side to block inward movement of the bolt, and bolt actuating means adapted when actuated to c0- operate rst with said mechanism to effect 'withdrawal of the detent before effecting inward movement of said bolt.

3. In a lock, a lock bolt, a plate pivoted within the bolt head, a spring tending to hold the plate entirely within the head, a bar slidable on the lock bolt and engaging with said plate to project same beyondv the bolt head side, and actuating mechanism for -said lock bolt adapted when actuated to "-irst withdraw said bar to allow said plate to enter the bolt head and then to shift said bolt inwardly.

4. In a lock, `a lock bolt, plates pivoted in the head of said bolt, springs tending to hold saidplates entirely within said head,

a wedge bar slidable on said bolt` means tending to force said bar between said plates to cause spreading thereof and extension beyond the bolt head sides, and actuating means for said bolt adapted when actuated to first withdraw said wedge bar to allow entrance of the plates into the bolt head to release the bolt and then to shift the release bolt inwardly.

5. In a lock the combination of a lock bolt, means tending to hold the bolt out detent plates pivoted in the head of said b olt, means tending to hold said plates entirely within said head, a wedge bar slidable on said bolt, means tending to hold said bar out wit-h its wedge end between said plates to cause said plates to project beyond said bolt head, a pin extendingr from said bar` 1 said bolt having a slot through which said v pin extends, and an actuating arm engaging said pin to shift thev bar to release the de- Licata? tent plates and to draw thel bolt in when said pin reaches the end of said slot.

t5. lin a lock the combination of a lock bolt, means tending to hold the bar out, a detent plate pivoted in the head of the bolt,

ka spring tending to hold the plate entirely within said bead, a. bar slidable on said bolt and extending into said head, means tending to bold said bar in engagement with said plate to cause said plate to project beyond the head side, actuating means connected with both said bar and bolt, and means whereby upon operation of said actuating means said bar is actuated first to release said plate and Said bolt then drawn in.

7, ln a lock, a lock bolt, pawlspivoted in the head of said bolt and means tending to hold said awls within the bolt head sides, a bar ten ing to force said pawls out beyond the bolt head sides, actuating mechanism for controlling the retractive movement of said bolt and bar and operableto move the bar in advance of the bolt whereby said pawls are first withdrawn to allow movement of the bolt, a tongue pivoted in said bolt head and extending beyond the, front face thereof, said bar being in the path ot said tongue whereby upon inward movement of said tongue said bar will be shifted in to eect release of said pawls to allow the bolt to move in.

ln testimony whereof l have signed my,

name to this specification in the presence of two subscribingl witnesses this 20th day of October, A. D. 1913, at Chicago, illinois,

` WILLAM A. LURIE. 

